Time-series analysis of polycyclic aromatic hydrocarbons and vehicle exhaust in roadside air environment in Bangkok, Thailand

Field monitoring was conducted in Bangkok to investigate the situation of traffic emission exposure of roadside pedestrians. From a viewpoint of actual exposure of pedestrians, short-term variations of air pollutant levels are significant, however, such data have been limited until recently. Hence, time-series data of traffic flows, polycyclic aromatic hydrocarbons monitored by real-time photoelectric aerosol sensors and vehicle exhaust detected as uncomfortable odor to pedestrians were obtained at very fine time resolution and their short-term peak patterns were analyzed by spectral analysis. Furthermore, conditions of the peak exposure occurrences and interrelations of those temporal variations were discussed